Improvement in grate-bars



ELOY N. SCHMITZ, OF PARIS, FRANCE.

IMPROVEMENT IN GRATE-BARS.

Specification forming part of Letters Patent No. 167,57 l, dated September 7, 1875; application tiled August 10, 1875. l

-section of a portion of afurnace embodying iny improvements. Fig. 2 is a transverse vertical section of the saine. Figs. 3, 4, 5, and 6 represent detached parts, hereinafter described.

The grate, in its preferred form, is composed of hollow gratebars A, having an external diameter of one hundred and seventy-five inilli nieters, supported at two points in their length by two transverse bearing-bars, b, supported by the lateral walls of the furnace. The hollow grate-bars are open from end to end, and are so placed as to leave an open space of about thirty millimeters between their inner ends and the back wall of the furnace. Each gratebar, throughout that part which lies in the furnace or fire-box, is perforated, as shown in Figs. l and 2. The interior ol' each hollow grate-bar is cylindrical, terminating at the outer or front end in an orifice of polygonal section, as shown at a., Fig. 2. This orifice is intended to receive the key, by which the bar may be rota-ted in either direction or rocked. Between the grate-bars and the furnace-door G is au interval or space, closed by boxes C, which t and are held between the door-sill T and the grate-bars, and are movable, so that any one of them may be removed to permit the removal of its bar. A covering-plate, E, secured to the front of the furnace by bolts, and with a scalloped lower edge, to t down around the projecting ends of the grate-bars,

and into bearing-grooves b formed in those ends, serves still further to close this space,

and also to hold and assure the grate-bars in position.

The gratebars may be made of any suitable shape other than cylindrical, as, for instance, polygonal, as shown in section in Fig. 6.

The perforations, also, are not necessarily circular, but may be rectangular, as in Fig. 3, or of any other suitable shape, the size of the perforations depending upon the conditions of the case, and whether line or coarse fuel is used.

The bars are also preferablyprovided with external ribs ,or projections, as shown at c, Figs. l and 4, and these projections may be in spiral form, as shown, or otherwise disposed. The ribs are designed, as will be readily understood, to stir the fire and to hasten the precipitation of the ashes and cinders into the ash-pit.

In lien of bearing-grooves b, the bars may be provided with projecting ribs, to engage a groove in the covering-plate.. w

The bars being open from end to end, their condition at all times may be readily ascertained by looking into their outer open ends. If it be found that any of the perforations are closed or clogged, the bar can be at once rotated to present fresh apertures for admission of air to the fuel.

What I claim, and desire to secure by Letters Patent, is-

A revolving, hollow, openended, perforated grate-bar, provided with an external bearinggroove, or its speciedequivalent, and having .its outer open end angularly formed, as and for the purposes set forth, with or without external ribs or projections, as described.

In testiinon y whereof I have signed my name to this specification before two subscribing witnesses.

E. N. SCHMITZ.

Witnesses EMILE BARRAULT, AUG. VrNcK. 

